RX630_15 Datasheet, PDF (52/156 Pages) Renesas Technology Corp – Renesas MCUs

RX630 Group
2. CPU
2. CPU
The RX CPU has sixteen general-purpose registers, nine control registers, and one accumulator used for DSP
instructions.
General-purpose register
b31
b0
R0 (SP)*¹
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
DSP instruction register
b63
Control register
b31
b0
ISP
(Interrupt stack pointer)
USP
(User stack pointer)
INTB
(Interrupt table register)
PC
(Program counter)
PSW
(Processor status word)
BPC
(Backup PC)
BPSW (Backup PSW)
FINTV
FPSW
(Fast interrupt vector register)
(Floating-point status word)
b0
ACC (Accumulator)
Note 1. The stack pointer (SP) can be the interrupt stack pointer (ISP) or user stack pointer (USP), according
to the value of the U bit in the PSW.
Figure 2.1
Register Set of the CPU
R01DS0060EJ0160 Rev.1.60
May 19, 2014
Page 52 of 154